Recently we have reported the observation of colossal magnetostriction effect in HoMn2O5 single crystals. Besides we have made the supposition for possible correlation between the peculiarities, observed in the field depended polarization measurements, and the colossal magnetostriction effect at a 4.2 K temperature. In this article we present our results received by polarization and magnetostriction measurements on HoMn2O5 and TbMn2O5 single crystals and the strong correlation between magnetostriction and polarization phase transition for these two compounds. The origin of this correlation is discussed.
We report detailed thermal expansion and magnetostriction experiments on GdCoIn$_5$ and GdRhIn$_5$ single crystal samples that show a sudden change in the dilation at a field B$^\ast$ for temperatures below the Néel transition temperature TN. We present a first-principles model including crystal-field effects, dipolar and exchange interactions, and the dependence of the exchange couplings with lattice distortions in order to fully account for the magnetostriction and magnetic susceptibility data. The mean-field solution of the model shows that a transition between metastable states occurs at t…
Stretched exponential behavior in remanent lattice striction of a (La,Pr)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayer manganite single crystal
本文研究了（La，Pr）$_{1.2}$ Sr $_{1.8}$ Mn $_{2}$ O $_{7}$单晶的弛豫磁致伸缩随时间的变化，以研究双层锰氧化物晶格畸变的慢动力学。双交换和Jahn-Teller型轨道-晶格相互作用之间的竞争导致所观察到的晶格轮廓遵循拉伸指数函数。这一发现表明，空间增长的本地晶格畸变加上电子$_{g}$ -电子轨道强烈相关的外观场诱导的CMR效应。
Anomalous pressure effect on the remanent lattice striction of a (La,Pr)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayered manganite single crystal
本文研究了（La，Pr）$ab$ Sr $_{1.8}$ Mn $_{2}$ O $_{7}$双层锰氧化物单晶在场致铁磁金属（FMM）相变温度范围内的压力效应。为了比较，我们还研究了在相应温度下磁化曲线的压力依赖性。外加压力降低了FMM转变的临界场，增强了回复磁致伸缩。观察到一个异常的压力效应的rexistine晶格弛豫，是类似的压力效应沿c轴的rexistine磁化。这些发现是从双交换相互作用驱动的FMM态通过施加压力而增强的观点来理解的。
Long-Range Magnetic Interactions Induced by the Lattice Distortions and the Origin of the E-type Antiferromagnetic Phase in the Undoped Orthorhombic Manganites
Steplike Lattice Deformation of Single Crystalline (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ Bilayered Manganite
本文报道了（La $_{0.4}$ Pr $_{0.6}$）$_{1.2}$ Sr $_{1.8}$ Mn $_{2}$ O $_{7}$双层锰氧化物的阶梯状晶格转变，并伴随着磁化和磁阻跃变，研究了场致一级相变的超尖锐性质，即从顺磁性绝缘体到铁磁性金属相的转变，并伴随着电阻的巨大下降.我们的研究结果支持，突然的磁致伸缩是密切相关的轨道挫折存在于不均匀的顺磁绝缘相，而不是竞争的两相之间的马氏体的情况。
Resistive relaxation in field-induced insulator-metal transition of a (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayer manganite single crystal
研究了（La $_{0.4}$ Pr $_{0.6}$）$_{1.2}$ Sr $_{1.8}$ Mn $_{2}$ O $_{7}$单晶的电阻弛豫，以考察双层锰氧化物场致绝缘体-金属转变的慢动力学.在recrystalline电阻中观察到的时间分布遵循拉伸指数函数，伴随着类似于在磁化和磁致伸缩数据中获得的缓慢弛豫。我们证明了在磁输运中的弛豫与磁弛豫有着密切的关系，可以在有效介质近似的框架下理解，假设一阶参数与二阶参数成比例。
Multi-scale Phase Modulations in Colossal Magnetoresistance Manganites
大量的实验结果提出了在锰氧化物的巨磁电阻观测到的多尺度相位调制现象。两个关键类型的相位不均匀性直接相关的庞磁电阻（CMR）进行了讨论。第一种类型涉及结构和电子不同相的微米级共存。我们提出了广泛的实验数据的原型系统表现出这样的相共存，（La，Pr）$_{5/8}$ Ca $_{3/8}$ MnO $_{3}$。这些数据表明，在该系统中的金属-绝缘体转变的弛豫输运现象起着关键作用，并在很大程度上负责显着的磁电阻的大小。多相态的相组成受电子关联和马氏体调节应变的影响。第二种类型的非均匀状态是在高温下通常在锰氧化物中发现的顺磁状态中实现的。在这种状态下，纳米级的结构相关性与纳米级的电荷/轨道有序区域进行观察。众多的锰氧化物系统的实验研究表明，这些相关性是通用的正交混合价锰氧化物，相关区域的CMR效应中起着至关重要的作用。
The link between the metamagnetic transition and novel spin-triplet superconductivity of UTe$_2$ was discussed thermodynamically through magnetostriction measurements in a pulsed-magnetic field. We revealed a discontinuous magnetostriction across the metamagnetic transition at $μ_0H_{\rm m}\approx 35$~T for the applied magnetic fields along the crystallographic $b$ axis in the orthorhombic structure. The resultanting volume magnetostriction of $ΔV/V \approx-5.9\times 10^{-4}$ gives the initial pressure dependence of $H_{\rm m}$ by employing the Clausius-Clapeyron's equation, which agrees with …
We investigate the effect of Ni${\text -}$substitution on the crystalline structure and the critical behavior of $Nd_{0.6}Sr_{0.4}Mn_{1-x}Ni_{x}O_{3}$ (0.00 $\leq$ x $\leq$ 0.20) perovskite. X${\text -}$ray diffraction patterns revealed that the major phase in all samples is the orthorhombic structure with space group $\textit{Pnma}$. Rietveld refinement revealed a linear reduction in the lattice parameters along with monotonic reduction in the O2${\text -}$Mn${\text -}$O2 angel with increasing Ni concentration. The modified Arrott plots and the Kouvel${\text -}$Fisher method have been used to…
We have studied a nearly stoichiometric insulating Y$_{0.97(2)}$Cr$_{0.98(2)}$O$_{3.00(2)}$ single crystal by performing measurements of magnetization, heat capacity, and neutron diffraction. Albeit that the YCrO$_3$ compound behaviors like a soft ferromagnet with a coersive force of $\sim$ 0.05 T, there exist strong antiferromagnetic (AFM) interactions between Cr$^{3+}$ spins due to a strongly negative paramagnetic Curie-Weiss temperature, i.e., -433.2(6) K. The coexistence of ferromagnetism and antiferromagnetism may indicate a canted AFM structure. The AFM phase transition occurs at $T_\tex…
